Strong’s Greek
G4243 — presbeuo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
πρεσβεύω
presbeuo — pronounced pres-byoo'-o
from the base of 4245; to be a senior, i.e. (by implication) act as a representative (figuratively, preacher):--be an ambassador. see GREEK for 4245
2 occurrences in the KJV.
2 Corinthians 5:20
Now then we are ambassadors for Christ, as though God did beseech you by us: we pray you in Christ’s stead, be ye reconciled to God.
Ephesians 6:20
For which I am an ambassador in bonds: that therein I may speak boldly, as I ought to speak.